[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/SHOWBIZ/Music/07/09/jackson.wrap/art.jackson.dr.cnn.jpg caption="Dr. Arnold Klein, who was Michael Jackson's dermatologist, said he warned the singer about drug use."]
Alan Duke and Saeed Ahmed
It was not surprising that investigators found bottles of prescription drugs in Michael Jackson's home, the singer's dermatologist said, as two sources told CNN that Jackson's sister Janet attempted an intervention two years ago.
I'm very shocked by it, but I have to tell you it's not something that would be unheard of," Dr. Arnold Klein said Wednesday on CNN's "Larry King Live," adding that he repeatedly warned Jackson about the danger of such drugs.
Meanwhile, two sources close to the Jackson family said Wednesday that sister Janet, the pop star, was so worried after visiting the emaciated singer in 2007 that she tried to stage an intervention with assistance from her other brothers.
Michael Jackson reportedly ordered his security guards not to let the family members in. He also refused to take calls from his mother, Katherine.
"If you tried to deal with him, he would shut you out," one source said. "You just wouldn't hear from him for long periods."
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